Pixel Electrode and Bank Layout for Outgassing-Safe Display Deposition
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Solution Overview
Problem
Display devices face defects due to outgassing and ink overflow issues during the application of light emitting elements, leading to non-uniformity and processability problems.
Innovation Solution
The implementation of partition walls, electrodes, insulating layers, and banks in a display device design, including holes in the electrodes and banks, to prevent outgassing and ink overflow, ensuring uniform distribution and improved processability of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If partition walls and banks are used to define pixel areas, then light emitting element distribution is improved, but outgassing defects occur during manufacturing
Solution Approach 1:
The partition wall is divided into a first partition wall portion and a second partition wall portion that are spaced apart from each other, creating a segmented structure that allows outgas to escape while maintaining the light emitting element distribution function
Solution Approach 2:
The harmful outgassing function is extracted from the solid partition wall structure by creating gaps between the first and second partition wall portions, allowing the outgas to be removed from the system while retaining the beneficial light emitting element distribution
2Manufacturing precision
If banks are used to confine light emitting elements, then uniformity is improved, but ink overflow to adjacent pixels occurs during application
Solution Approach 1:
The bank structure is segmented into a first bank portion and a second bank portion with a gap between them, allowing the bank to confine light emitting elements while preventing ink overflow through the spaced configuration
Solution Approach 2:
The harmful ink overflow is extracted from the continuous bank structure by introducing a gap between the first and second bank portions, allowing excess ink to be removed or evaporate without contaminating adjacent pixels
3Manufacturing precision
If solid partition walls are used to separate pixels, then pixel definition is improved, but outgas accumulation causes defects
Solution Approach 1:
The partition wall is designed as a porous or gap-containing structure rather than a solid continuous wall, allowing outgas to pass through or escape while maintaining pixel separation and definition
Data Source
AI summary
A display device includes partition walls overlapping an emission area and spaced from each other, electrodes on the partition walls and spaced from each other, a first bank on the electrodes and in a non-emission area, light emitting elements between the electrodes in the emission area; and a second bank on the first bank, and the electrodes include a hole overlapping the first bank.